我有一個ListView和Datatemplate,它包含一個Movies列表。它被數據綁定到一個ObservableCollection,但是每當我編輯Movie.Name它都不會更新ListView,即使在我的PropertyChangedEventHandler中調用「Name」時使用「Name」調用。Datavinding ObservableCollection <T> MVVM
我加2「電影」 s到我的收藏我的初始化和這些顯示正確(Klovn電影,服用)
所以,當我點擊編輯,應該更改所選電影的文字和改變它的名稱爲「測試」,並且被更改爲,但該更改未在ListView中顯示,但如果使用foreach輸出Collection,則Name爲Test。
View.xaml
<Window x:Class="MovieDB3.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<DockPanel>
<Menu DockPanel.Dock="Top">
<MenuItem Header="File">
<MenuItem Header="Edit" Click="MenuEditClick"/>
</MenuItem>
</Menu>
<Grid DockPanel.Dock="Top">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition/>
</Grid.RowDefinitions>
<ListView VerticalAlignment="Stretch" Name="ListViewMovies" ItemsSource="{Binding Path=Collection}" IsSynchronizedWithCurrentItem="True" >
<ListView.ItemTemplate>
<DataTemplate>
<WrapPanel>
<TextBlock Text="{Binding Path=Name}"/>
</WrapPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
</DockPanel>
</Window>
View.cs
using System;
using System.Windows;
using MovieDB3.Models;
using MovieDB3.ViewModels;
namespace MovieDB3
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private MainViewModel MVM;
public MainWindow()
{
InitializeComponent();
MVM = new MainViewModel();
DataContext = MVM;
}
private void MenuEditClick(object sender, RoutedEventArgs e)
{
MVM.setMovieName((Movie)ListViewMovies.SelectedItem, "test");
}
}
}
視圖模型
using System;
using System.ComponentModel;
using MovieDB3.Models;
using System.Collections.ObjectModel;
namespace MovieDB3.ViewModels
{
class MainViewModel : INotifyPropertyChanged
{
public ObservableCollection<Movie> Collection {get; set;}
public MainViewModel()
{
Collection = new ObservableCollection<Movie>();
//Test kode
Movie movie = new Movie();
movie.Name = "Klovn The Movie";
Collection.Add(movie);
movie = new Movie();
movie.Name = "Taken";
Collection.Add(movie);
}
public void setMovieName(Movie movie, string newName)
{
//movie.Name = newName;
Console.WriteLine("CurrentName: " + movie.Name);
int i = Collection.IndexOf(movie);
Collection[i].Name = newName;
Console.WriteLine("NewName: " + movie.Name);
NotifyPropertyChanged("Name");
}
public void setMovieName(string currentName, string newName)
{
foreach (Movie movie in Collection)
{
if (movie.Name.Equals(currentName))
{
movie.Name = newName;
NotifyPropertyChanged("Name");
return;
}
}
}
//public string MovieName
//{
// set
// {
// NotifyPropertyChanged("MovieName");
// }
//}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
}
}
Movie.cs
using System;
namespace MovieDB3.Models
{
class Movie
{
public string Name { get; set; }
public int Id { get; set; }
public double Rating { get; set; }
public DateTime Release { get; set; }
public TimeSpan Runtime { get; set; }
public String Trailer { get; set; }
}
}
但是在http://journals.hjtcentral.com/Home/tabid/428/EntryId/432/MVVM-for-Tarded-Folks-Like-Me-or-MVVM-and-What-it-Means-to -Me.aspx他們把INotifyPropertyChanged放在ViewModel中?這是錯的嗎? – Mech0z 2011-01-21 19:11:05